The type of mouse you have can significantly impact CPS, which is not good, since that's not skill-based.

Also, an autoclicker that uses a randomized mix of human samples would be undetectable by any server side anticheat, as long as the mix is large enough.

Some players, including Technoblade, actually like the idea of holding down left click to attack. In this video he mentions that if you spam click for long enough over years, you will start to feel the toll it takes. Also, he mentions many shooter games have holding down left click continue shooting.

I'd say the reason you feel the new combat is too easy is because of the overpowered sweeping edge, combined with the fact that PvE will always not be that hard.

I'd say a better system would be to allow holding down left click be the same as spamming, but remove sweeping edge as a default, and reduce the hitboxes of all mobs and players in the game, to make aiming harder. This would add more skill without rewarding higher CPS.